Data/hora: 14/06/2024 11:52:27

Provedor de dados: | 65
País: | Brazil
Título: | Lab-scale periphyton-based system for fish culture
Autores: | Cavalcante,Davi de Holanda; Silva,Suzete Roberta da; Pinheiro,Paloma Damasceno; Martins,Ádila da Cunha; Sá,Marcelo Vinícius do Carmo e.
Data: | 2011-12-01
Ano: | 2011
Palavras-chave: | Periphyton; Tilapia; Feeding restriction; Fish culture.
Resumo: | The present research aimed to assess a lab-scale model to study periphyton-based systems for fish culture. Twenty-five liters plastic aquaria were stocked with three Nile tilapia, Oreochromis niloticus, juveniles (0.77±0.09g; 12 fish m-2) for 6 weeks in a 2x2 factorial design. Small plastic bottles were placed in some aquaria for periphyton development. Two feeding regimes were employed: "full-fed" (standard feeding rates were fully adopted) and "half-fed" (50% of standard feeding rates). Growth performance and limnological variables were observed in each aquarium. There werefive replicates per treatment. Fish have fed actively on periphyton, especially in the half-fed aquaria. The placement of periphyton bottles had no significant effects on the water quality variables, except by the gross primary productivity which became lower. Half-fed aquaria presented lower concentrations of ammonia (0.28-0.29mg L-1), nitrite (0.33-0.37mg L-1) and phosphorus (0.42-0.43mg L-1) than full-fed aquaria (0.57-0.60mg L-1; 0.75-0.77mg L-1; 0.67-0.70mg L-1, respectively). The final body weight of fish in half-fed aquaria with periphyton bottles (6.22±0.64g) was significantly higher than in aquaria without bottles (4.65±0.36g). Although the growth rate of fish was lower in the half-fed aquaria (4.27-4.72 vs. 5.29-5.61% BW day-1), survival was significantly higher when compared to the full-fed aquaria (93.3-100.0 vs. 80.0-83.4%). Only in the aquaria with periphyton the feed conversation ratio was improved by the feeding restriction regime.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011001200022
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/S0103-84782011005000146
Formato: | text/html
Fonte: | Ciência Rural  v.41 n.12 2011
Fonte: | info:eu-repo/semantics/openAccess